Nope, Power brick is about the same size, a bit thinner. 153 X 75 X 30 (in mm)for the brick versus ... 130 X 100 X 40 (in mm) or something like that for the hub. But it does indeed get hot sometimes. Especially now we have a heatwave here in Europe.
This is why I want to see better EGPU docks that also have all these ports but also have 120mm silent fans built in.